ecco qua i codici

FILE 1
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE entities SYTSEM "entities.dtd">
<entities>
<de id="001" structure="verb">sa’ala</de> <de id="002" structure="defNP">as-siğāni</de> fīmā tufaqqiru? wa <de id="003" structure="verb">sa’la</de><seg id="004" structure="b_pro">hu</seg> <de id="005" structure="defNP">bidaura</de><seg id="006" structure="b_pro">hu</seg>.
</entities>

DTD FILE 1
<!ELEMENT entities (#PCDATA|de|seg)*>
<!ELEMENT de (#PCDATA|seg)*>
<!ELEMENT seg (#PCDATA)>
<!ATTLIST de id ID #REQUIRED
structure(defNP|indefNP|verb|Name|subj_pro) #REQUIRED>
<!ATTLIST seg id ID #REQUIRED
structure (b_pro) #REQUIRED>

FILE 2
?xml version="1.0" encoding="UTF-8"?>
<coreference>
<coref_seg xmlns:xlink="http://www.w3.org/2000/xlink" xlink:type="simple"
xlink:href="entities_xml.txt#xpointer(@id='004' and @id='002')"/>
</coreference>

riguarderò XSLT...grazie per l'aiuto
Tommaso